Fast switching between multiple Remember The Milk accounts

I've got 3 groups of teams that I oversee. I've got a RTM account set up for each group. Each group contains several tabs for different teams.

I know I could set up tagging and get it all into 1 account but then my personal stuff and 2 other groups are all combined when I look at what I've personally got to do today.

It'd be nice to have a way to tie several accounts to 1 owner. Kind of like what 37signals has done with basecamp/backpack/highrise. You use an openID to log in and then any accounts that use that same openID show up in a very small out of the way black menu bar at the top. You can have as many accounts as you want.